JPH0316315Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to housings for electrical equipment containing built-in amplifiers, tuners, cassette decks, video decks, etc., particularly for various electrical equipment requiring electromagnetic shielding.

[Conventional technology]

Since this type of electrical equipment is affected by electromagnetic noise that enters from the outside or generates noise from the equipment itself, it is generally housed in a metal case and provided with electromagnetic shielding.

On the other hand, the metal case is often stacked in multiple tiers or on which a heavy object such as a television set is placed, and it is necessary to ensure a predetermined drop test strength and ceiling wall deflection strength. Therefore, conventionally, decorative steel sheets with a relatively large thickness of 0.7 mm or more have been frequently used.

[The problem that the idea aims to solve]

However, although such thick decorative steel sheets have excellent strength and electromagnetic shielding properties, they are heavy and
Manufacturing costs are high. Therefore, it is desired to reduce the thickness of the steel plate used.

In order to meet such demands, the present inventor considered reducing the thickness of the steel plate and reinforcing it by providing ribs on the ceiling wall itself. However, in that case, there were design problems such as unevenness appearing on the outer surface of the case, and we learned that it was not suitable for housings in household electrical equipment.

Furthermore, in recent years, the use of ICs in electronic components has progressed, and in order to prevent parts from being damaged by static electricity, it is necessary to ground the upper case side, which is easily touched by the human body. There was an inconvenience that required time and effort.

The present invention was proposed from this point of view, and its purpose is to provide a housing for electrical equipment without sacrificing its functionality or strength.
To obtain a housing that is lightweight and can easily take measures against static electricity.

[Means to solve the problem]

As shown in FIG. 2, the housing according to the present invention consists of a lower case 2 that houses an electronic circuit component 3, and an upper case 6 that covers the upper part of the lower case 2. The upper case 6 is particularly problematic. As shown in Figure 1, a decorative metal plate 7 is formed by bending side walls 13 and 14 from the side edge of a ceiling wall 10, and a conductive metal plate 7 is formed with a large number of parallel reinforcing ribs 15 protruding toward one side. A backing plate 8 is provided on at least the inner surface side of the top wall 10 of the decorative metal plate 7.
are joined via an adhesive layer 9 with the reinforcing ribs 15 facing inward of the case.

[Effect]

With the above configuration, even if a heavy object is placed on the top wall 10 of the decorative metal plate 7, the backing plate 8 provided with the reinforcing ribs 15 prevents the top wall 10 from bending, and the thickness of the decorative metal plate 7 This means that it can be made thinner.

Adhesive layer 9 between decorative metal plate 7 and backing plate 8
serves as a buffer band and suppresses as much as possible minute vibrations that occur when a speaker is placed on the top surface of the ceiling wall 10 or when a blower is installed inside the housing.

〔Example〕

The drawings show an example in which the present invention is implemented in a video deck, but the present invention is of course applicable to various electrical devices that require electromagnetic shielding, such as tuners and personal computers.

As shown in Fig. 2, the housing 1 of the present invention is comprised of a lower case 2 that is open from the top and is made of a conductive steel plate, such as an electrolytic galvanized steel plate, so that it can be easily grounded. 3 is housed, and a front panel 4 equipped with operation switches and the like is attached to the front side, and a rear panel 5 equipped with connection terminals and the like is attached to the rear side. Furthermore, the upper surface of the opening of the lower case 2 is covered with an upper case 6, and this upper case 6 is screwed to the lower case 2.

The upper case 6 is formed by bonding a backing plate 8 to the inner surface of the case of a decorative metal plate 7 via an adhesive layer 9, as shown in FIG.

That is, the decorative metal plate 7 is a decorative steel plate with a predetermined design coating applied to the surface of the steel plate with a thickness of about 0.3 mm, and as shown in FIG.
By bending inward at right angles at points A and B, the side wall 1 is
3 and 14 are bent downward and connected in a U-shaped cross section. Note that the decorative metal plate 7 may be made of other metal plates such as aluminum having electromagnetic shielding properties. Further, the surface decoration may be a decorative foil or a decorative sheet in addition to the coating film.

The backing plate 8 may be an untreated plate such as a cold-rolled steel plate, but is preferably made of a material with excellent corrosion resistance and conductivity, such as a galvanized steel plate or an electroplated steel plate with a thickness of about 0.3 mm, and is pressed using a suitable method such as a press. By this means, a large number of parallel reinforcing ribs 15 are formed in advance over almost the entire surface so as to protrude toward one surface. Of course, the backing plate 8 may be made of stainless steel.

The backing plate 8 having such a shape is the top wall 1 of the decorative steel plate 7.
A total of three sheets are prepared corresponding to 0 and both side walls 13 and 14, and each is bonded to the inner surface of the decorative steel plate 7 via an adhesive layer 9 with the reinforcing rib 15 facing downward, that is, toward the inside of the case. .

The backing plate 8 to be joined to the ceiling wall 10 is cut out in advance in a portion corresponding to the region of the ventilation hole 16 provided in the ceiling wall 10. On the other hand, the back plate 8 is set to have a longitudinal length slightly longer than the top wall 10, and in addition to the back side of the top wall 10, the top wall edges 11 and 12 connecting the top wall 10 and the side walls 13 and 14 are It is also reinforced from the back side. The backing plates 8 of the side walls 13 and 14 can also be omitted.

[Another embodiment example]

Note that the respective wall thicknesses and wall thickness ratios of the decorative steel plate 7 and the backing plate 8, or the reinforcing ribs 15 formed on the backing plate 8,
The number, protrusion height, shape, etc. can be changed as appropriate depending on conditions such as the strength required by the target housing and the material used.

Furthermore, instead of cutting out or punching out the portion of the backing plate 8 corresponding to the portion of the decorative steel plate 7 where the ventilation holes 16 are formed, the backing plate 8 is bonded to the ceiling wall 10 and then the backing plate 8 is attached to the ceiling wall 10 and the backing plate 8 is bonded to the top wall 10. The ventilation hole 16 may be punched out in a penetrating shape across the plate 8. In addition, the decorative steel plate 7 can be used as a single piece without dividing the backing plate 8 into three parts.
It may be made to cover the entire back side.

Furthermore, the shape of the decorative steel plate 7 is not limited to a U-shaped cross section, but can be arbitrarily changed such as a cylindrical shape.

[Effect of idea]

According to the present invention, the inner surface of the case of the decorative metal plate 7, especially the top wall 10, which requires a certain strength, is reinforced with the backing plate 8 provided with reinforcing ribs 15, so that electromagnetic shielding properties and physical While maintaining the strength and freedom of design as before, the weight of the entire housing can be reduced, and transportation costs can be reduced.

Moreover, since the backing plate 8 itself is conductive, there is no need to take any troublesome work such as local peeling of the paint film on the decorative metal plate 7, and the upper case 6 can be easily grounded. Damage to the circuit components 3 due to static electricity can be prevented.

Furthermore, since the adhesive layer 9 is interposed between the decorative metal plate 7 and the backing plate 8, even if an object that easily vibrates, such as a speaker, is placed on top of or inside the ceiling wall 10, vibration-proofing is possible. The effect is well demonstrated,
Has many advantages.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the upper case, which is a component of the present invention, FIG. 2 is an exploded perspective view of the whole, and FIG. 3 is a plan view of the inner surface shape of the upper case in an expanded state. DESCRIPTION OF SYMBOLS 1...Housing, 2...Lower case, 3...Electronic circuit component, 6...Upper case, 7...Decorative metal plate, 8...Backing plate, 9...Adhesive layer, 10...Top wall, 13, 14...Side wall, 15...Reinforcement rib.

Claims (1)

[Scope of Claim for Utility Model Registration] A housing comprising a lower case 2 containing an electronic circuit component 3 and an upper case 6 covering the upper part of the lower case 2, wherein the upper case 6 is located on the side of the ceiling wall 10. From the edge to the side wall 13,
It consists of a decorative metal plate 7 in which 14 are bent and connected in series, and a conductive metal backing plate 8 in which a large number of parallel reinforcing ribs 15 are formed so as to protrude toward one side, and at least the top of the decorative metal plate 7 A housing for electrical equipment characterized in that a backing plate 8 is bonded to the inner surface of a wall 10 via an adhesive layer 9 with reinforcing ribs 15 facing inward of the case.